Should I use 720p or 1080i for the Y/Pb/Pr output?
The HDT100 will “scale” the incoming format to whatever you select, although the default is 480i. If you select “1080i”, the STB will output 1080i even if the broadcast comes in at 720p. Whether you select 1080i or 720p is usually personal preference as it is sometimes extremely difficult to tell the difference between the two picture qualities.